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US 4,787,709 AGranted
Optical fiber having glass core and fluoro-copolymer cladding
AssigneeCentral Glass Company, Limited
InventorsAkira Kawada, Takashi Yasumura, Toshio Koishi
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Abstract
The invention relates to an optical fiber of the step-index type using quartz glass or an inorganic optical glass as the core material and a fluorine-containing resin as the cladding material. A copolymer of vinylidene fluoride with hexafluoroacetone, preferably at a molar ratio in the range from 96:4 to 88:12, is employed as the cladding material. Using such a copolymer, a highly transparent and very strong and tough cladding layer can easily be formed by a solution coating method.
Claims5
An optical fiber of the step-index type comprising:
- a solid cylindrical core which is formed of an inorganic glass;
- and
- a cladding layer which is in close contact with said core and is formed of a copolymer of vinylidene fluoride with hexafluoroacetone wherein the molar ratio of vinylidene fluoride to hexafluoroacetone in said copolymer is in the range from 96:4 to 88:12.
Dependencies are inferred from the claim text.